| 摘要 |
The essential feature of the new toothbrush is the relative position of the handle (1) to the head (3) and the bristle pattern (4). An angle reference plane (11) lying on the bristle side coincident with an upper surface of the brush handle intersects the bristle pattern either at the surface (15), the edge between the said surface and the side (16) facing the handle, or on the side (16) of the bristle array facing the handle. Relative to the bristle array surface (15), an acute angle ( alpha ) of from 5 DEG to 20 DEG is formed between the two planes. The new toothbrush therefore is a bristle array surface set at an angle to the handle and improved force transfer to the working surface of the bristle array.
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